A seven-coordinated DyIII single-ion magnet with C2v symmetry constructed by a multidentate Schiff-base ligand. Issue 8 (3rd February 2021)

• Record Type: Journal Article
• Authors: Wang, Ruirui; Yao, Binling; Bai, Feifei; Wang, Wen; Li, Licun; Ma, Yue; Wang, Qinglun; Zhao, Bin; Zhang, Yuanzhu
• Is Part Of: CrystEngComm. Volume 23:Issue 8(2021)
• Page Start: 1718
• Page End: 1722
• Publication Date: 2021-02-03
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d0ce01826k
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Utilizing a flexible Schiff-base ligand with large steric hindrance helps to stabilize the seven-coordinated Ln III complexes; Dy III complex with C 2v low symmetry still displays the SIM behavior. Abstract : Two isostructural mononuclear lanthanide complexes [Ln(H2 L)Cl3 ](Ln = Dy(1 ), Tb(2 ), H2 L = 6, 6′-(((oxybis(2, 1-phenylene))bis-(azanylylidene))bis(methanylylidene))bis(2-methoxyphenol)) were synthesized by solvothermal reaction. In both complexes, the Ln III ions are seven-coordinated with a LnO4 Cl3 coordination core in the C 2v symmetry. Magnetic measurements reveal that Dy III complex 1 shows field-induced two-step magnetization relaxation processes with U eff = 53.47 K (slow relaxation) and 26.94 K (fast relaxation), respectively. The analysis of energy levels and eigenstates suggests that the mixed ground state doublets result in the field induced single-ion magnet behaviour of complex 1 . In addition, the magneto-structural correlation, including the easy magnetic axis of Dy III ion, was further discussed based on an electrostatic model calculation. This work gave another example of designing low-coordinated Ln-SIMs by utilizing a multidentate Schiff-base ligand with large steric hindrance.